There was really no good reason for Canon to replace the EOS 20D. And so, commendably, it didn't.
The new EOS 30D ($1,400 street, body only) might well be considered a "20D II" or a "20DN," given that it uses the same 8MP CMOS sensor, processing engine, viewfinder system, chassis, and control layout of the now-discontinued 20D. But you now get a bigger LCD screen (a 2.5-incher), a spotmeter, more burst capacity, a tougher shutter mechanism, and assorted other new or upgraded features.